| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Reduction Technology
|
| Presentation Title |
The Influence of Calcium Fluoride on Entrainment of Electrolyte During Metal Siphoning |
| Author(s) |
Curtis Landon, Stephen Lindsay, Brian Zukas |
| On-Site Speaker (Planned) |
Curtis Landon |
| Abstract Scope |
Calcium fluoride is an inevitable component of electrolyte in the Hall-Héroult process for primary aluminum production due to calcium impurities in the consumed raw materials. The high partition coefficient of calcium between electrolyte and aluminum metal reinforces the importance of tracking inputs of this element. CaF2 aids the process by reducing the liquidus and therefore operating temperatures. Its negative impacts on alumina solubility and electrical conductivity are generally acceptable when the calcium fluoride content of bath is kept between 4.5 to 6.5 wt.%. Of additional concern is its impact on the density of electrolyte, bringing it closer to that of the molten aluminum metal. In this paper it has been proposed that there is a demonstrable, negative impact on the amount of electrolyte that is entrained with metal during siphoning, especially with reduction cells that do not have deep metal levels. This is an undesirable outcome for multiple reasons.
|
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Electrometallurgy, |